20405452344500 has 24 divisors (see below), whose sum is σ = 44565507921480. Its totient is φ = 8162180937600.

The previous prime is 20405452344491. The next prime is 20405452344517. The reversal of 20405452344500 is 544325450402.

It can be written as a sum of positive squares in 4 ways, for example, as 746710287376 + 19658742057124 = 864124^2 + 4433818^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20405451845 + ... + 20405452844.

It is an arithmetic number, because the mean of its divisors is an integer number (1856896163395).

Almost surely, 2^{20405452344500} is an apocalyptic number.

20405452344500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20405452344500 is an abundant number, since it is smaller than the sum of its proper divisors (24160055576980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20405452344500 is a wasteful number, since it uses less digits than its factorization.

20405452344500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40810904708 (or 40810904696 counting only the distinct ones).

The product of its (nonzero) digits is 384000, while the sum is 38.

Adding to 20405452344500 its reverse (544325450402), we get a palindrome (20949777794902).

The spelling of 20405452344500 in words is "twenty trillion, four hundred five billion, four hundred fifty-two million, three hundred forty-four thousand, five hundred".